Drill-holder



A. WILLIAMS.

DRILL HOLDER.

APPLICATION mzn SEPT. 1, 1920.

1,391,034. nt dseph 20,1921.

- UNITED STATES PATENT OFFICE.

ARTHUR WILLIAMS, or GRAND RAPIDS, MICHIGAN, ASSIGNOR To WILMARTH &

MOBMAN COMPANY, or GRAND RAPIDS, MICHIGAN, A CORPORATION or MICH- IG-AN.

DRILL-HOLDER.

Specification of Letters Patent. Patented Sept, 20, 1921;

Application filed September 7, 1920. Serial No. 408,496.

Kent and State of Michigamhave invented certain new and useful Improvements in Drill-Holders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. This invention relates to drill holders. In

' grinding drills for use in drillingmetal, it

,,with suflicient lipclearance andthe right angle of the dead center line. ,.A further the different diameters of drills, making use"- is important thatthe drills be held in proper relation to the grinding wheel toobtain the proper angle of grind, particularlywhen the,

to receive and tohold any of such drills in proper position with referenceto the grind-c ing wheel that a true and accurate grinding of the drill may be had, the proper angles to the cutting lips being obtained together object of the invention is to make a supporting shank or end support for the drills:

which is adjustable ina novel manner for of a plurality-of supporting centers whereby the amount of adjustment in-a'nycase will not be more than one-half of an inch/with the distance between centers equal toeone- :and five siXteenths inches, though, of course,

the number of centers and the distances between is not, restricted'i'n any sense, being a matter of desired design. Various. other objects and purposesthan those specifically:

" stated willappear as understanding. of the invention is had from the following description,taken inconnectionwith the accom panying drawing, in which,

Figure 1 is a side. elevation of thedrill holder, showing its application to a.-grinding machine, the npperpart of whichappearsin the figure.

Fig. 2 is an enlarged side elevatlon of the shank'support. for drills in thedrill-holder, parts beingbroken away and shownin sec-.-

the column 6. .mount of'bracket 8 together with the adtion.

Fig. 3 is an end elevation of the construction shown in Fig. 2, and,

Fig. 4 is a section on line 4. of Fig. 1. Like reference characters refer to like parts in the different figures of the drawing.

The drill holder includes in its construction anelongated bar 1 which, at one end,

.is formed with two upwardly extending angularly positioned sides 2 adapted to make a rest for the drill atthe cutting end thereof,

. said sides2 being madeintegral with the bar 1 and being cut at one edge to correspond with the face of the grinding wheel 4 when the holder is attached to a grinding machine, said edges 3 of the sides- 2 being vertical when thus positioned and paralleling the' face of the grinding wheel! The grinding wheelis secured at one end'of a shaft 5 rotatably mounted at the upper end of a column or similar support 6. Shaft 5 is adapted tobe driven by a belt passing around a pulley 7 on the shaft. Any other equivalent means of driving may be used. A bracket 8 is attached to the bar 1 near its upper end and is swivelly mounted in a socket 9 formed on" a bracket 10 which, in turnis 'rotatably mounted on a stud shaftll projecting from The *angle 'of' the swivel justa'ble connection of bracket 10 'on the tion to more clearly disclose the construcshaft 11 permits any desired range of ad,

justment of the drill holder to the grinding wheel and in practice, said drill holder extends downwardly at an angle to the vertical from its upper end as shown.

f The support for the end of the shank off the drill comprises a bracket 12 havinga foot piece 13 adapted to slide on the. upper side of bar 1 and from which a rod 14 threaded at its lower end extends downwardly through said bar 1 which isslotted for the passage of the rod. A clamping nut 15 threads onto the end of rod 14 and binds against the under side of bar .1 to se cure said shank support against movement.

Bracket 12 at its upper part is formed with an'enlarg'ed'portion 16. A rod 17' passes therethrough and is adjustable lengthwise thereon, being keyed against rotation 'as shown. -An adjusting screw 18 passes into the portionw16. below rod 17 and threads through a nut 19 set into said portion 16,

being formed adjacent its outer end with a narrow collar 20 which is received in an an nular groove 21 made in rod 17 near its outer end. The screw 18 is equipped with an operating head 22 for manual operation, it being evident from this construction that by turning the head, rod 17 and attached parts may be moved any desired amount in either direction-with respect to the support- I ing bracket 12.

At its inner end the rod 17 is enlarged as indicated at 23, and has a guide block24 attached thereto in the face of which a dove tail groove is cut vertically to receive a slide 25, the same being slidably mounted between vertical guides 24, one at each side of the guide block. A plurality of centers 26 extend from the slide 25, being located equal marked 0 andgraduated marks in fractions of an inch both above and below the center line for one'half of an inch. On the slide 25 a line, indicated at 32, is made. The centers 26 are indicated as 1, 2 and 3 and when the line 32 is in conjunction with the center line at 0 on scale 31, the different centers are properly positioned to take one inch,

3 two inch and .three inch drills. .It is obvious that movement of the slide in either direction will position the centers to take either larger or smaller drills than those indicated by their numerals, depending upon the direction of movement of the slide, and that any diameter of drill between may be held in the drill holder as well as the three sizes named by proper adjustment of the slide with respect to the scale.

Drills areheldin the nished by the angularly positioned sides 2 and securely held at their shank ends on the centers 26 as shown in Fig. 1 where the drill 33 is thus supported. This drill holder is relatively simple in construction, furnishes a perfect support for the drillof whatever size and holds it in proper position for grinding, grinding the lips of the drill equally andwiththe sameangle to the axis of -;the drill, both lips being given the same clearance angle and'with the angle of the dead center line ground properly. With this drill holder the necessity of an intermediate suport for the body of the drill is obviated;

. he construction is very practical, and long ranges of adjustment for different sizes of front support fur drills are obviated with the plurality of.

centers used.

The invention is defined in the appended claims and I consider that the invention comprehends all forms or modifications in structure thatcome within the scope of the said claims.

I claim: 1. A drill holder comprising an elongated supporting bar formed at one end with angularly disposed sides making a V-shaped trough to receive the end of the drill to be ground, a bracket slidably mountedon' the" bar adjacent the other end thereof, a rod passing through the bracket above the bar, means to adjust said rod lengthwise to different positions, a guide blockon the inner end ofthe rod, a Slide adjustably mounted on the guide block and adjustable vertically with respectrthereto, means for adjusting the slide to different positions, and a plurality of spaced apart centers extending one over the other from the slide, said guide block at one side ofthe slide carrying a measuring scale for directing the extent of adjustment of the slide, and said slide being rovidedwith an indicating mark for use 1n relation to said scale, substantially as and for the purposes described.

2. A drill holder comprising a supporting bar provided at oneend with a trough to receive the end of a drill, a bracket adjustably mounted adjacent the other end of the bar, a vertically positioned guide block located adjacent the bracket, means to adjust said block toward or away from thebracket,

a slide mounted for vertical adjustment on the guide block, means for adjusting the slide to different positions, and a plurality of spaced apart centers on the slide positioned one over theother, said guide block being equipped with a measuring scale and said slide with a direction mark for use in relation to said scale, substantially as and for the-purposes described.

bar formedat one end with a drill receiving trough, a bracket adjustably mounted adjacentthe other end of the bar, and means mounted on the'bracket for adjustment toward or away from the'bracket and for ver- 3. A drill holder'comprising a supporting tical adjustment, said'means bein adapted to enga e with the end of the drill shank, and inc uding a plurality of spaced apart centers for engagement with differentsizes of drills, substantially as described.

4. A drill holder comprisinga bar-provided at one end with a drill receiving; i

trough, a bracket adjustably mounted on the bar adjacent its opposite end, a guide block mounted on the bracket for adjustment .to-'

Ward or away from the bracket, a slide mounted on the block,'means for adjusting the slide vertically to different positions,

and a plurality of centers located in spaced apart relation one over the other and extending from the slide toward said trough, substantially as described.

5. A drill holder comprising abar formed at one end with a drill receiving trough, a slide carried by the bar adjacent 1ts opposite end and having means of mounting on the bar whereby said slide may be adjusted toward or awa from the trough and also vertically to di erent positions, and a plurality 10 of e ually spaced centers projecting from the side toward said trough, substantially as described.

In testimony whereof I aflix my signature.

ARTHUR WILLIAMS. 

